Radio control device



3 f -.1. BERGLIN 1,771,284

RADIO CONTROL DEVICE Filed July 11, I927 Patented July 22, 1930 "UNITED STATES j PA T I JOEL BERGLIN, F mnnnnonnnwr'raennnnnr .f

:a'Amo CONTROL nnvron Application filedJ'uly 11, 1927, Serial No. 204,851; and in'German-y July 16; 1526.

The tuning devices alreadyxknown for measuring and control instruments for the purposes of telegraphyand others requiring some revolutions of the driving device are equipped with several distinct dials, one for one revolution and with an index hand polnting to the said dials. In these apparatus either the dials are displaced in such a such a manner that always only one dial is opposite to the hand, or the hand is displaced so that itindioates to one of the several dials or a single dial for showing the angle of each half or complete revolution of the driving device and anotherdevice for indicating the number of the said half or complete revolutions are provided. But these devices are complicated in construction, doubtful in action and reading and very high in price.

For these reasons they have not come into practice. I

In consideration of the well known drivinggears the device being the object of the present invention is extremely simple,'com

pletely proof in actionand clear in reading.

It allows exact reading at anytime without any doubt by using several dials and only one switchable multiple index hand arranged at thetuning part of the device. According to the invention the hand is equipped with various arms, one for each dial, angularly displaced to each other. Furthermore there are oneor several projections onthe dial in order to switch automatically the index hand from .one dial to another. i In the accompanying drawing several embodiments of the invention are shown, preterably provided for plate-condensers or the like of broad-casting apparatus.

Fig l is a section along the line I-I of Fig. 2, showing a constructional example,

i. e. adevice provided with a gear. and a,

"Figs. 2 and 3 are cross-sections along the l lies I'III resp knob being only indicated in part.

.spective view of a gear box with holes for the switching of'the index-arms and the catch device.

as seen in the direction of the arrows indicated at the endsof the section lines.

Figs. 4 and 5 show part views of knobs provided with thehand and'catch devices as seen from behind in a direction inclined by about 45 tothe axle ofthe apparatus and on a larger scale than that ofthe Figs. 1-3.

view similar to Figures 4 and 5 in an intermediate position when being switched, the

Fig. 7-corresponding to Fig. 6-is a per- Fig. 8 shows a perspective view of the front part of a condenser in the front board of which a driving gear is. elastically mounted. l V

In the embodiment of the invention shown in Figs. 1 to 3 a plate-condenser 1 of a well 7 known "construction is arranged upon the back of a'panel board 2, the frustrum' 3 of its shaft projecting through a suitable bore to the front of said board. A boss 4 of a pinion 5 is secured to the frustrum 3 by means of a set screw 6. Over a longer shank 7 of the boss 4 a. sleeve 8 having apinion 9is rotatablyimounted which sleeve 8 is fastened to. a I

normal knob 11 of the condenser by a screw 10. r

Furthermorethe shank 7'of the sleeve 4 is mounted in a bore of a plate-like holder 12 particularly shaped and arranged between the pinions 5and 9. In another bore 13 of said holder 12 is journalled ashaft'15having a pinion 14m; one end andanother'pinionlfi at the opposite end. The pinion 14E meshes V with the pinion 9 and the pinion 16 with the pinion 5 mounted on the frustrum- Sby means 'ofthesleeve 4. For securing the gear 14, 16'

and the'holder 12 againsttorqueanangular stop 17 screwed to the panel board 2 enljgages a s1otl 8 of -the holder 12. ;Moreover 109 of the condenser-knob 11. I On the back of this border, in a hole'35 of corresponding shape is inserted a metal sheet by border the holder 12 is provided with a further slot 19 the peculiar shape of which allows a certain resiliency of the part of thissaid holder bearing, in thebore 13, the shaft 15 and the pinions 14, 16 In consequence of this the. pinions 14 and 16 are elastically pressed against the pinions 9 and 5 centrally. A nose 20 of the chief part of the holder 12 may Test against a stop 21 of the part'of the holder 12 bearing the pin 15 and may thus prevent this 36, having a semi-circular hollow 37 opening towards the axle of the knob 11. On the back of the border of'the knob, in a line from said axle to said hollow37, a pin 38 is mounted upon whichan index hand 39 having three arms 40, 41 and 42 (see Figs. 1, 2 and 6) is rotatably arranged. At a corresponding distance aside the pin. 38, a trunnion 43 is arranged serving as a stop for the end positions of the indicating hand 39, 40, 411 and 42.

Furthermore a catch disk 44 formingja three-pointed star is fastened to the hand 39,

.40, 41, 42, adjacent to the back of the condenser-knob. A roller 45 is rotatablymount ed on a pin 46 ournalled to one end of aplate spring 47 the otherend of whichis joined to the knob lland is resiliently lying against the disk 44. V v

In the embodiments of the invention shown in Figs. 4 and 5 the catch devices differ somethingfrom the foresaid construction. The

hand 39 according to Fig.5, on the side op posite to the arms 40, 41 is provided with rounded openings 48 into whiclra roller 45,

elastically secured like that in Figs; 1 and 2, ma enter by means ofva spring as beforesaid. According to Fig. the metal sheet 36 is equipped with two lateral laps 49 projecting at a right angle and supporting a plate spring 50 lodged in slots of the said laps. The hand is lying with corresponding stop faces 51 against said spring: .In order to secure the guidingof the hand and of the spring aguide. part '52 is provided on-the backof the index. Moreover in Fig; 4 the stop pin 43 of the first construction (Figs. 1 tjo 3) is substituted 6O ofthe groovez in the back "of the knob.

:For al supplenieiitary Miami tavice according to the invention tea-tuning. de

vicelmounted in an apparatus it-is often usefuljto einploy a gearb ozr' consisting of an 7 annular part- 56 provided with an" end plate- 57 as shown in Fig. 7. The annular part possesses corresponding holes 58 and 59 opposite the pin 22 in order to give way for the switching of the index hand and for the catch device. The indicating system and the gear of the latter arrangement are corresponding to those as shown in Figs. 1 to 6; but the pin 38 must be of such a length that the arms of the hand 39 are close to the dial 34. Thus a doubtless, clear and easy reading of the scales is obtained. According to Fig. 8 the gear may be lodge in the front board of the condenser itself.

. into the board.

The working of the device for controlling the condenser is as follows:

The reach of rotation of a normal plate condenser being only 180 revolution) is enlarged to several revolutions by means of the gear. Thus moreexact adjustment to the waves of the sending-stations is obtained and. the different senders may be separated more easily and more exactly in consequence of the enlarged reach of rotation. In the examples'shown in Figs; 1 to 3 and 8 a transmission ratio of 1 :3 and one of1 :2 are provided for the gears 5,16 and 9, 14 equal to a total ratio of 1: 6, i. e. to an angle of rotation of 180, of the plates of the condenser correspond to three complete revolutions of the condenser knob .11.

Start-ing on the position of the hand shown minimum adjustment of the hand the arm points to the inner part designated in the figure by scale 34. lVhen rotating the knob -11 and the pinion 9 counter-clockwise (in direction of the arrow indicated in Fig. 1) by neans of the gears 9, 14 and '16, 5 the frustrum 30f the condenser is rotated in the same direction. Thereby the sleeves 4 and 8 are rotated relatively to one another. After one revolution of the knob 11 the arm 40, when :now being turned further in the same direcpart M is now to be used for reading. T ogether with the hand 39, the catch disk 44 fastened to it is also rotated round the pin 38' by an angleof120. The roller slides over the'corresponding point of the disk 44 into the' following recess of the same underv in Fig.1 being assumed to correspond to the the-action of the sp-ring47. Thus'the work- "ing position of the arm 41 of the hand 39 is'exactly adjusted and catche'd. After the knob ll has-then rotated further on by one;

revolution in the same direction for the secnd time the hand 39, 40, 41, 42 is switched then again round the pin 38 by means of the pin 22 by an angle of 120?, then the arm 42 projecting alone over the border of the knob 11 is pointing to the outer part (marked out by O) of the scale 34. Now the arm 41 is resting against the stop pin 43. The catch device 44 is also moved in the foresaid manner during this rotation, whereas during the first rotation of the hand, i. e. when the inner scale is to be used and the arm 40 is projecting over the border of the knob 11, the arm 42 is resting against the pin 43. This pin must be arranged at such a place of the border of the knob 11 that the shortest arm 40 may be turned round the pin 38 without touching the pin 43. When the knob is rotated backwards, i. e. clockwise, the foresaid operations are repeated in a corresponding inverse turn. V

In the'example according to Figs. 4 and 5 the hand is provided with only two arms 40 and 41 and is only catched in another manner whereas the switching of it is carried out exactly as beforesaid but only by 90 instead of by 120 the total transmisslon ratio of the gearing being 1:4 instead of 1: 6 in the former case. According to Fig. 4

the arms are catched in their adjustments by the pressing of the spring 50 against the faces 51 of the hand 39.

The construction shown in Fig. 5 has no special catch disk, the hand 39 itself being provided with recesses 48 serving as a catch and into which the roller 45 is pressed by the spring 47 The construction and working of the embodiment of the invention according to Figs. 7 and 8 are understood from what has been said above having in mind that the gearing has been mounted in the condenser board plate.

The new system of the holder with the gear and the switchable hand for adjustment by many steps may be employed not only for a rotary movement, but also for a straight lined movement, for instance with condensers provided with plates to be shifted endwise instead of being rotated as shown in the drawing. In such case the final pinion of the gear corresponding to the pinion 5 of the figuresmust co-act with that part of the device to be moved in straight line, e. g. directly for instance by means ofa rack or indirectly by means of a drum, an endless rope drive, an endless chain or the like.

Instead of providing the dial with the pin 22 on the board 2 these parts of the device may be arranged on the border of the knob 11; the switchable hand 39, 40, 41, 42 must then be journalled to the panel board. The action and operation is the sameas beforesaid.

multiple dial having a special scale for each revolution and cooperating with said multiple hand.

2. Tuning devices for measuring and control instruments preferably in broadcasting apparatus comprisingin combination a transmission gearing being arranged between the part to be tuned and the driving part thereof which is rotatable by more than one revolution, and an indicating device consisting of a switchable multiple hand provided with at least two arms and of a multiple dial pro vided with a number of scales corresponding to the number-of said arms each arm and corresponding scale being provided for only one special revolution of the driving part.

3. Tuning devices for measuring and control instruments preferably in broadcasting apparatus comprising in combination a transmission gearing being arranged between the part to be tuned and the driving part thereof which is rotatable by more than one revolution, and an indicating device consisting of a switchable multiple hand provided with at least two arms and of a multiple dial provided with a number of scales corresponding to the number of said arms each arm and corresponding scale being povided for only one special revolution of the driving part, switching stops for automatically switching the hand and end stops for terminating the driving movement being arranged cooperating with said switchable hand.

4. Tuning devices for measuring and con trol instruments preferably in broadcasting apparatus comprising in combination a transmission gearing being arranged between the part to'be tuned and the driving part thereof which is rotatable by more than one revolution, and an indicating deviceconsistmg of a switchable multiple dial provided, with atleast two arms of different lengths and ofa multiple dial provided with a number of scales corresponding to the number of said arms and neighbouring-to each other each arm and corresponding scale being.p1'o vided for only one special revolution of the driving part. g l

I11 testimony whereof I afdx my signature.

JOEL BERGLIN. 

